||It has been an increasing trend for companies to migrate their businesses onto or publicize on the Internet. Business process reengineering (BPR) can be used to migrate the business processes of the supply chain onto the Internet. Such migration may cause some of the processes merged together, minimised, or transformed into other process within a supply chain. Therefore, careful planning for such migration with technical requirements is necessary. In this thesis, the business processes of supply chain are defined as marketing, sourcing, quotation, negotiation, transaction, and delivery. This thesis illustrates how each of these processes can be changed in order to migrate them onto the Internet and the measurement of Electronic Commerce (EC) impact on supply chain. Guidelines are provided from planning the changes for the migration of business processes onto the Internet, implementing the changes, and measuring the impact of Electronic Commerce (EC) on supply chain. In addition, a l0-step procedure includes stages of system analysis, decision-making, management, implementation, and maintenance, which gives guidelines from planning the changes for the migration of business onto the Internet and to implementing the changes with technical requirements is provided. The implementation stage of the l0-steps migration procedure is further decomposed into a four-phase implementation model which guides managers through digitisation of paper-based system, building of communication infrastructures with other companies, implementation of EC-front-end system, and integration of vertical portal with technical, security, and financial requirements. The remaining thesis describes how the impact of EC on supply chain can be measured with six equally important factors of cost, time, inventory, quality, satisfaction, and value. Finally, an industrial example is used to illustrate the corresponding evolution as a result of EC deployment.